In the Final function, move the context zeroing into the digest != NULL

scope so that passing a NULL digest is equivalent to the Pad function
(like it used to be).  Fixes skey w/ sha1 as noticed by David Krause.

src/lib/libc/hash/md4.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: md4.c,v 1.5 2004/05/03 18:07:07 millert Exp $	*/
+/*	$OpenBSD: md4.c,v 1.6 2004/05/28 15:10:27 millert Exp $	*/
 
 /*
  * This code implements the MD4 message-digest algorithm.
@@ -19,7 +19,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$OpenBSD: md4.c,v 1.5 2004/05/03 18:07:07 millert Exp $";
+static const char rcsid[] = "$OpenBSD: md4.c,v 1.6 2004/05/28 15:10:27 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -134,8 +134,8 @@ MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx)
 	if (digest != NULL) {
 		for (i = 0; i < 4; i++)
 			PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
+		memset(ctx, 0, sizeof(*ctx));
 	}
-	memset(ctx, 0, sizeof(*ctx));	/* in case it's sensitive */
 }
 
 

src/lib/libc/hash/md5.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: md5.c,v 1.6 2004/05/03 18:07:07 millert Exp $	*/
+/*	$OpenBSD: md5.c,v 1.7 2004/05/28 15:10:27 millert Exp $	*/
 
 /*
  * This code implements the MD5 message-digest algorithm.
@@ -18,7 +18,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$OpenBSD: md5.c,v 1.6 2004/05/03 18:07:07 millert Exp $";
+static const char rcsid[] = "$OpenBSD: md5.c,v 1.7 2004/05/28 15:10:27 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -133,8 +133,8 @@ MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *ctx)
 	if (digest != NULL) {
 		for (i = 0; i < 4; i++)
 			PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
+		memset(ctx, 0, sizeof(*ctx));
 	}
-	memset(ctx, 0, sizeof(*ctx));	/* in case it's sensitive */
 }
 
 

src/lib/libc/hash/rmd160.c

@@ -32,7 +32,7 @@
 #include <rmd160.h>
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: rmd160.c,v 1.16 2004/05/03 18:07:07 millert Exp $";
+static char rcsid[] = "$OpenBSD: rmd160.c,v 1.17 2004/05/28 15:10:27 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #define PUT_64BIT_LE(cp, value) do {                                    \
@@ -155,11 +155,11 @@ RMD160Final(u_int8_t digest[RMD160_DIGEST_LENGTH], RMD160_CTX *ctx)
 	int i;
 
 	RMD160Pad(ctx);
-	if (digest != NULL)
+	if (digest != NULL) {
 		for (i = 0; i < 5; i++)
 			PUT_32BIT_LE(digest + i*4, ctx->state[i]);
-
-	memset(ctx, 0, sizeof (*ctx));
+		memset(ctx, 0, sizeof (*ctx));
+	}
 }
 
 void

src/lib/libc/hash/sha1.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: sha1.c,v 1.18 2004/05/05 17:09:46 millert Exp $	*/
+/*	$OpenBSD: sha1.c,v 1.19 2004/05/28 15:10:27 millert Exp $	*/
 
 /*
  * SHA-1 in C
@@ -15,7 +15,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$OpenBSD: sha1.c,v 1.18 2004/05/05 17:09:46 millert Exp $";
+static const char rcsid[] = "$OpenBSD: sha1.c,v 1.19 2004/05/28 15:10:27 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -173,6 +173,6 @@ SHA1Final(u_int8_t digest[SHA1_DIGEST_LENGTH], SHA1_CTX *context)
 			digest[i] = (u_int8_t)
 			   ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 		}
+		memset(context, 0, sizeof(*context));
 	}
-	memset(context, 0, sizeof(*context));
 }

src/lib/libc/hash/sha2.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: sha2.c,v 1.9 2004/05/07 14:34:40 millert Exp $	*/
+/*	$OpenBSD: sha2.c,v 1.10 2004/05/28 15:10:27 millert Exp $	*/
 
 /*
  * FILE:	sha2.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$OpenBSD: sha2.c,v 1.9 2004/05/07 14:34:40 millert Exp $";
+static const char rcsid[] = "$OpenBSD: sha2.c,v 1.10 2004/05/28 15:10:27 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -549,10 +549,8 @@ SHA256_Final(u_int8_t digest[SHA256_DIGEST_LENGTH], SHA256_CTX *context)
 #else
 		memcpy(digest, context->state, SHA256_DIGEST_LENGTH);
 #endif
+		memset(context, 0, sizeof(*context));
 	}
-
-	/* Zero out state data */
-	memset(context, 0, sizeof(*context));
 }
 
 
@@ -832,10 +830,8 @@ SHA512_Final(u_int8_t digest[SHA512_DIGEST_LENGTH], SHA512_CTX *context)
 #else
 		memcpy(digest, context->state, SHA512_DIGEST_LENGTH);
 #endif
+		memset(context, 0, sizeof(*context));
 	}
-
-	/* Zero out state data */
-	memset(context, 0, sizeof(*context));
 }